骨

gu

bone; skeleton

bones with meat are still bones;

'gua' means bones without the surrounding meat

氵

shui

滑

hua

slippery

water/liquid (shui) + bone (gu)

a liquid on the bone reflects smoothness - but things could easily become slippery

豊

feng

体

ti

body

person (ren) + root (ben)

the root of a person is his healthy body